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Stockholders' Deficit - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 21, 2026 $ / shares | Jul. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) vote $ / shares | Jun. 30, 2025 USD ($) $ / shares | Mar. 31, 2026 USD ($)
Capital Unit [Line Items] |  |  |  |  |
Number of votes per share of common stock permitted on proposals presented to stockholders (vote) | vote |  |  | 1 |  |
Cash dividends declared, per common share (in dollars per share) | $ / shares |  |  | $ 0.82 | $ 0.71 |
Excise tax accrual |  |  | $ 65 |  | $ 40
Excise tax payment |  | $ 26 |  |  |
Shares Repurchased |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Excise tax accrual |  |  | $ 25 | $ 2 |
Subsequent Event |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Cash dividends declared, per common share (in dollars per share) | $ / shares | $ 0.94 |  |  |  |

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